tool to calculate color combination

[Astan Chee]

Hi,
I was just wondering if there is a tool/script in python that allows me 
to do color calculations; specifically, when I add them.
Also I was thinking that for this to work other than a simple way, some 
form of measure is included. e.g 50% red(1,0,0) + 50% yellow(1,1,0) =  
100% orange(1,0.7,0)
Is there such a tool in python?
Thanks for any information
Astan

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